<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    
</head>
<body>
    <button>发送请求</button>
    <script>
        const oBtn = document.querySelector('button');
        oBtn.onclick = async function(){
            try{
                let data = await getData();
                console.log(data);
            }catch(e){

            }
        }

        function getData(){
            return new Promise((resolve, reject)=>{
                const xhr = new XMLHttpRequest();
                xhr.open('get', 'https://api.uixsj.cn/hitokoto/get?type=social');
                xhr.send();
                xhr.onreadystatechange = function(){
                    if(xhr.readyState === 4) {
                        if(/^2\d{2}$/.test(xhr.status)){
                            resolve(xhr.response);
                        }else{
                            reject(xhr.status);
                        }
                    }
                }
            })
        }
    </script>
</body>
</html>